Camera setting such as 'bulb' or shutterspeed reported as readonly

[mpbtech]

Sony Corp. ILCE-7M2

gphoto2 2.5.28

Copyright (c) 2000-2021 Marcus Meissner and others

gphoto2 comes with NO WARRANTY, to the extent permitted by law. You may
redistribute copies of gphoto2 under the terms of the GNU General Public
License. For more information about these matters, see the files named COPYING.

This version of gphoto2 is using the following software versions and options:
gphoto2 2.5.28 gcc, popt(m), exif, cdk, aa, jpeg, readline
libgphoto2 2.5.31.1 standard camlibs, gcc, no ltdl, EXIF
libgphoto2_port 0.12.2 iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi, gcc, no ltdl, EXIF, USB, serial without locking

trying to set items like 'bulb mode' or 'shutterspeed' and this reports back that they are 'read-only', I think it is like issue:

'#685'

when I try to set shutterspeed I get the following:

"gphoto2 --set-config shutterspeed=3

*** Error ***
Property shutterspeed is read only.
*** Error (-1: 'Unspecified error') ***"

with generate debug file and attach.

my-logfile.txt